Wanted to reach out and see what the masses recommend for a synthetic oil for a '06 F350 with a 6.0L diesel. I just put a new motor in my truck at 134Kmi and need to make this motor last. Years ago I used to race motocross and always ran Amsoil products in all my bikes. I swear by their products, but it's extremely expensive to buy 4.5 gal of Amsoil Syn diesel oil. Thanks for the help.